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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ba64604095486a32ca6711c041ddd9344799a76f80bb67e251c394ce0e5ef0' 
  AND token = 'pnHvtII+Ks2u1aydIYXP7IE8mhLYQIGISgez3crhXfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}